A kinetic method of determination of cobalt in zinc and cadmium selenide

Abstract

A kinetic method of cobalt determination has been applied for the determination of this element in zinc and cadmium selenides. The method is based on the catalytic effect of cobalt on the oxidation of Direct Blue 6B (C. I. 24410) by hydrogen peroxide at pH=10.8 and in the presence of tiron as an activator. The trace amounts of cobalt have been separated from the bulk zink and cadmium by means of the ion exchanger Lewatit 5080. In samples of 20–100 mg cobalt can be determined in the range of 7.1·10−5%–2.4·10−4%.